Angular2 Firestore: How to search in array

I am learning Angular and trying to use Firestore through angular2-firestore. I created 2 collections structured as this:

    export interface Account {
      uid: string;
      title: string;
      startDate: Date;
      endDate: Date;
      manager: User;
      members: User[];
    }

    export interface User {
      uid: string;
      email: string;
      displayName: string;
      isActive: boolean;
    }

Now I need to query accounts by a user who is member in it. What I could do is fetch all of the accounts and then filter them using Typescript code, but I thought there should be some more efficient way to do this. Anybody please help. Thanks in advance.

Update

In my service, I added a method like this:

    @Injectable()
    export class AccountService {
    private static ACCOUNTS_TABLE_NAME = 'accounts';
    
      constructor(private db: AngularFirestore) {
      }
    
      public getAllOpenAccountsIAmIn(user: User) {
        return this.db.collection(AccountService.ACCOUNTS_TABLE_NAME, ref => {
          return ref.where('endDate', '==', null)
            // .where('members', 'contains', user); -- this is what I want something like
        }).valueChanges();
      }
    }